If anyone else wants in on the Adelicia-going-to-receive-the-first-ever-batch-of-mass-produced-Hunters-who-are-also-Paleblood-Hunters, I think it would be a quite easy way to start the story for anyone in the Healing Church. They would certainly want to make an effort to avoid losing their precious experiments, along with the actual Paleblood Hunters, even if that "loss" might only be in a metaphysical sense in that they might die and discover the Hunter's Dream before the church has properly imprinted on the.

And for anyone having trouble coming up with interesting backgrounds for their characters, keep two things in mind:
I'm not actually asking for or requiring that your characters even [I]have[/I] a background, especially if they are one of the prospective (false) Paleblood Hunters. It's not uncommon for humans undergoing metamorphosis to experience memory loss to varying extents, as seen with the player in Bloodborne (who forgets nearly everything), so they might not even know who they are or why they are there.
And by far most of the population of Yharnam is currently "outsiders"; people from beyond the lands associated with the city that moved there to partake in blood healing. There aren't a whole lot of people there who have been around for more than five years, since the Night of the Blood Moon killed a ton, turned another ton into beasts and nearly all of the rest mad. I'm not saying that you can't or shouldn't make a native of Yharnam, only that it would probably give you a lot of freedom and play well into the lore to say that your character is from somewhere else.